source: MondoRescue/branches/stable/mindi-busybox/e2fsprogs/ext2fs/swapfs.c @ 821

Last change on this file since 821 was 821, checked in by Bruno Cornec, 14 years ago

Addition of busybox 1.2.1 as a mindi-busybox new package
This should avoid delivering binary files in mindi not built there (Fedora and Debian are quite serious about that)

File size: 8.4 KB
Line 
1/*
2 * swapfs.c --- swap ext2 filesystem data structures
3 *
4 * Copyright (C) 1995, 1996, 2002 Theodore Ts'o.
5 *
6 * %Begin-Header%
7 * This file may be redistributed under the terms of the GNU Public
8 * License.
9 * %End-Header%
10 */
11
12#include <stdio.h>
13#include <unistd.h>
14#include <string.h>
15#include <time.h>
16
17#include "ext2_fs.h"
18#include "ext2fs.h"
19#include "ext2_ext_attr.h"
20
21#if BB_BIG_ENDIAN
22void ext2fs_swap_super(struct ext2_super_block * sb)
23{
24    int i;
25    sb->s_inodes_count = ext2fs_swab32(sb->s_inodes_count);
26    sb->s_blocks_count = ext2fs_swab32(sb->s_blocks_count);
27    sb->s_r_blocks_count = ext2fs_swab32(sb->s_r_blocks_count);
28    sb->s_free_blocks_count = ext2fs_swab32(sb->s_free_blocks_count);
29    sb->s_free_inodes_count = ext2fs_swab32(sb->s_free_inodes_count);
30    sb->s_first_data_block = ext2fs_swab32(sb->s_first_data_block);
31    sb->s_log_block_size = ext2fs_swab32(sb->s_log_block_size);
32    sb->s_log_frag_size = ext2fs_swab32(sb->s_log_frag_size);
33    sb->s_blocks_per_group = ext2fs_swab32(sb->s_blocks_per_group);
34    sb->s_frags_per_group = ext2fs_swab32(sb->s_frags_per_group);
35    sb->s_inodes_per_group = ext2fs_swab32(sb->s_inodes_per_group);
36    sb->s_mtime = ext2fs_swab32(sb->s_mtime);
37    sb->s_wtime = ext2fs_swab32(sb->s_wtime);
38    sb->s_mnt_count = ext2fs_swab16(sb->s_mnt_count);
39    sb->s_max_mnt_count = ext2fs_swab16(sb->s_max_mnt_count);
40    sb->s_magic = ext2fs_swab16(sb->s_magic);
41    sb->s_state = ext2fs_swab16(sb->s_state);
42    sb->s_errors = ext2fs_swab16(sb->s_errors);
43    sb->s_minor_rev_level = ext2fs_swab16(sb->s_minor_rev_level);
44    sb->s_lastcheck = ext2fs_swab32(sb->s_lastcheck);
45    sb->s_checkinterval = ext2fs_swab32(sb->s_checkinterval);
46    sb->s_creator_os = ext2fs_swab32(sb->s_creator_os);
47    sb->s_rev_level = ext2fs_swab32(sb->s_rev_level);
48    sb->s_def_resuid = ext2fs_swab16(sb->s_def_resuid);
49    sb->s_def_resgid = ext2fs_swab16(sb->s_def_resgid);
50    sb->s_first_ino = ext2fs_swab32(sb->s_first_ino);
51    sb->s_inode_size = ext2fs_swab16(sb->s_inode_size);
52    sb->s_block_group_nr = ext2fs_swab16(sb->s_block_group_nr);
53    sb->s_feature_compat = ext2fs_swab32(sb->s_feature_compat);
54    sb->s_feature_incompat = ext2fs_swab32(sb->s_feature_incompat);
55    sb->s_feature_ro_compat = ext2fs_swab32(sb->s_feature_ro_compat);
56    sb->s_algorithm_usage_bitmap = ext2fs_swab32(sb->s_algorithm_usage_bitmap);
57    sb->s_reserved_gdt_blocks = ext2fs_swab16(sb->s_reserved_gdt_blocks);
58    sb->s_journal_inum = ext2fs_swab32(sb->s_journal_inum);
59    sb->s_journal_dev = ext2fs_swab32(sb->s_journal_dev);
60    sb->s_last_orphan = ext2fs_swab32(sb->s_last_orphan);
61    sb->s_default_mount_opts = ext2fs_swab32(sb->s_default_mount_opts);
62    sb->s_first_meta_bg = ext2fs_swab32(sb->s_first_meta_bg);
63    sb->s_mkfs_time = ext2fs_swab32(sb->s_mkfs_time);
64    for (i=0; i < 4; i++)
65        sb->s_hash_seed[i] = ext2fs_swab32(sb->s_hash_seed[i]);
66    for (i=0; i < 17; i++)
67        sb->s_jnl_blocks[i] = ext2fs_swab32(sb->s_jnl_blocks[i]);
68
69}
70
71void ext2fs_swap_group_desc(struct ext2_group_desc *gdp)
72{
73    gdp->bg_block_bitmap = ext2fs_swab32(gdp->bg_block_bitmap);
74    gdp->bg_inode_bitmap = ext2fs_swab32(gdp->bg_inode_bitmap);
75    gdp->bg_inode_table = ext2fs_swab32(gdp->bg_inode_table);
76    gdp->bg_free_blocks_count = ext2fs_swab16(gdp->bg_free_blocks_count);
77    gdp->bg_free_inodes_count = ext2fs_swab16(gdp->bg_free_inodes_count);
78    gdp->bg_used_dirs_count = ext2fs_swab16(gdp->bg_used_dirs_count);
79}
80
81void ext2fs_swap_ext_attr(char *to, char *from, int bufsize, int has_header)
82{
83    struct ext2_ext_attr_header *from_header =
84        (struct ext2_ext_attr_header *)from;
85    struct ext2_ext_attr_header *to_header =
86        (struct ext2_ext_attr_header *)to;
87    struct ext2_ext_attr_entry *from_entry, *to_entry;
88    char *from_end = (char *)from_header + bufsize;
89    int n;
90
91    if (to_header != from_header)
92        memcpy(to_header, from_header, bufsize);
93
94    from_entry = (struct ext2_ext_attr_entry *)from_header;
95    to_entry   = (struct ext2_ext_attr_entry *)to_header;
96
97    if (has_header) {
98        to_header->h_magic    = ext2fs_swab32(from_header->h_magic);
99        to_header->h_blocks   = ext2fs_swab32(from_header->h_blocks);
100        to_header->h_refcount = ext2fs_swab32(from_header->h_refcount);
101        for (n=0; n<4; n++)
102            to_header->h_reserved[n] =
103                ext2fs_swab32(from_header->h_reserved[n]);
104        from_entry = (struct ext2_ext_attr_entry *)(from_header+1);
105        to_entry   = (struct ext2_ext_attr_entry *)(to_header+1);
106    }
107
108    while ((char *)from_entry < from_end && *(__u32 *)from_entry) {
109        to_entry->e_value_offs  =
110            ext2fs_swab16(from_entry->e_value_offs);
111        to_entry->e_value_block =
112            ext2fs_swab32(from_entry->e_value_block);
113        to_entry->e_value_size  =
114            ext2fs_swab32(from_entry->e_value_size);
115        from_entry = EXT2_EXT_ATTR_NEXT(from_entry);
116        to_entry   = EXT2_EXT_ATTR_NEXT(to_entry);
117    }
118}
119
120void ext2fs_swap_inode_full(ext2_filsys fs, struct ext2_inode_large *t,
121                struct ext2_inode_large *f, int hostorder,
122                int bufsize)
123{
124    unsigned i;
125    int islnk = 0;
126    __u32 *eaf, *eat;
127
128    if (hostorder && LINUX_S_ISLNK(f->i_mode))
129        islnk = 1;
130    t->i_mode = ext2fs_swab16(f->i_mode);
131    if (!hostorder && LINUX_S_ISLNK(t->i_mode))
132        islnk = 1;
133    t->i_uid = ext2fs_swab16(f->i_uid);
134    t->i_size = ext2fs_swab32(f->i_size);
135    t->i_atime = ext2fs_swab32(f->i_atime);
136    t->i_ctime = ext2fs_swab32(f->i_ctime);
137    t->i_mtime = ext2fs_swab32(f->i_mtime);
138    t->i_dtime = ext2fs_swab32(f->i_dtime);
139    t->i_gid = ext2fs_swab16(f->i_gid);
140    t->i_links_count = ext2fs_swab16(f->i_links_count);
141    t->i_blocks = ext2fs_swab32(f->i_blocks);
142    t->i_flags = ext2fs_swab32(f->i_flags);
143    t->i_file_acl = ext2fs_swab32(f->i_file_acl);
144    t->i_dir_acl = ext2fs_swab32(f->i_dir_acl);
145    if (!islnk || ext2fs_inode_data_blocks(fs, (struct ext2_inode *)t)) {
146        for (i = 0; i < EXT2_N_BLOCKS; i++)
147            t->i_block[i] = ext2fs_swab32(f->i_block[i]);
148    } else if (t != f) {
149        for (i = 0; i < EXT2_N_BLOCKS; i++)
150            t->i_block[i] = f->i_block[i];
151    }
152    t->i_generation = ext2fs_swab32(f->i_generation);
153    t->i_faddr = ext2fs_swab32(f->i_faddr);
154
155    switch (fs->super->s_creator_os) {
156    case EXT2_OS_LINUX:
157        t->osd1.linux1.l_i_reserved1 =
158            ext2fs_swab32(f->osd1.linux1.l_i_reserved1);
159        t->osd2.linux2.l_i_frag = f->osd2.linux2.l_i_frag;
160        t->osd2.linux2.l_i_fsize = f->osd2.linux2.l_i_fsize;
161        t->osd2.linux2.i_pad1 = ext2fs_swab16(f->osd2.linux2.i_pad1);
162        t->osd2.linux2.l_i_uid_high =
163          ext2fs_swab16 (f->osd2.linux2.l_i_uid_high);
164        t->osd2.linux2.l_i_gid_high =
165          ext2fs_swab16 (f->osd2.linux2.l_i_gid_high);
166        t->osd2.linux2.l_i_reserved2 =
167            ext2fs_swab32(f->osd2.linux2.l_i_reserved2);
168        break;
169    case EXT2_OS_HURD:
170        t->osd1.hurd1.h_i_translator =
171          ext2fs_swab32 (f->osd1.hurd1.h_i_translator);
172        t->osd2.hurd2.h_i_frag = f->osd2.hurd2.h_i_frag;
173        t->osd2.hurd2.h_i_fsize = f->osd2.hurd2.h_i_fsize;
174        t->osd2.hurd2.h_i_mode_high =
175          ext2fs_swab16 (f->osd2.hurd2.h_i_mode_high);
176        t->osd2.hurd2.h_i_uid_high =
177          ext2fs_swab16 (f->osd2.hurd2.h_i_uid_high);
178        t->osd2.hurd2.h_i_gid_high =
179          ext2fs_swab16 (f->osd2.hurd2.h_i_gid_high);
180        t->osd2.hurd2.h_i_author =
181          ext2fs_swab32 (f->osd2.hurd2.h_i_author);
182        break;
183    case EXT2_OS_MASIX:
184        t->osd1.masix1.m_i_reserved1 =
185            ext2fs_swab32(f->osd1.masix1.m_i_reserved1);
186        t->osd2.masix2.m_i_frag = f->osd2.masix2.m_i_frag;
187        t->osd2.masix2.m_i_fsize = f->osd2.masix2.m_i_fsize;
188        t->osd2.masix2.m_pad1 = ext2fs_swab16(f->osd2.masix2.m_pad1);
189        t->osd2.masix2.m_i_reserved2[0] =
190            ext2fs_swab32(f->osd2.masix2.m_i_reserved2[0]);
191        t->osd2.masix2.m_i_reserved2[1] =
192            ext2fs_swab32(f->osd2.masix2.m_i_reserved2[1]);
193        break;
194    }
195
196    if (bufsize < (int) (sizeof(struct ext2_inode) + sizeof(__u16)))
197        return; /* no i_extra_isize field */
198
199    t->i_extra_isize = ext2fs_swab16(f->i_extra_isize);
200    if (t->i_extra_isize > EXT2_INODE_SIZE(fs->super) -
201                sizeof(struct ext2_inode)) {
202        /* this is error case: i_extra_size is too large */
203        return;
204    }
205
206    i = sizeof(struct ext2_inode) + t->i_extra_isize + sizeof(__u32);
207    if (bufsize < (int) i)
208        return; /* no space for EA magic */
209
210    eaf = (__u32 *) (((char *) f) + sizeof(struct ext2_inode) +
211                    f->i_extra_isize);
212
213    if (ext2fs_swab32(*eaf) != EXT2_EXT_ATTR_MAGIC)
214        return; /* it seems no magic here */
215
216    eat = (__u32 *) (((char *) t) + sizeof(struct ext2_inode) +
217                    f->i_extra_isize);
218    *eat = ext2fs_swab32(*eaf);
219
220    /* convert EA(s) */
221    ext2fs_swap_ext_attr((char *) (eat + 1), (char *) (eaf + 1),
222                 bufsize - sizeof(struct ext2_inode) -
223                 t->i_extra_isize - sizeof(__u32), 0);
224
225}
226
227void ext2fs_swap_inode(ext2_filsys fs, struct ext2_inode *t,
228               struct ext2_inode *f, int hostorder)
229{
230    ext2fs_swap_inode_full(fs, (struct ext2_inode_large *) t,
231                (struct ext2_inode_large *) f, hostorder,
232                sizeof(struct ext2_inode));
233}
234
235#endif
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